In the proces of creating the site information of our own archives and our consultants' has been used.

Referencetany sites:
burglib.org
bourgas.org/art
bapci.org
obstina-bourgas.org
greenbourgas.org
bourgas.org/wetlands
ropotamo.com
birding-in-bulgaria.com
koprivshtica-bg.hit.bg
plovdivguide.com
treasures.zonebg.com
archaeology.zonebg.com
traki.hit.bg
rozhen.com
kardjali-museum.org
arheo-filipov.hit.bg
rodopi-bg.com
momchilovtsi.hit.bg
journey.bgpeakview.bg
parkstrandja.hit.bg
biking-inbulgaria.com
bulgariansearesorts.com
burgasmuseums.bg
bsbcp.org
peakview.bg
terranatura.cjb.net